Question. If you were going to use a deer for food what is the best age/size to hunt?

Question. If the buck or doe is too old does the meat have a wild taste?

When I was a child we used to raise one or two heads of beef per year for slaughter. We would take the calf to the slaughter house at about nine months to one year old.

We would always put the calf in a barn stall keep it there about two or three weeks before slaughter. If you don't keep the calf pinned up for a few weeks the beef has a wild taste.

This thread here on TnDeer in the Quality Deer Management forum has pictures of different age bucks:

Field-judging buck age examples

I have eaten venison before. It's been years ago. I can't remember much about what it tasted like.